What is SessionStart?

A session-start hook that runs a JavaScript file with Node.js when a coding session begins.

Use it to trigger session-start.mjs from the installed plugin location, including path handling for Windows paths used through Linux.

It automates setup or initialization work that would otherwise need to be run manually at the start of every session.

SessionStart — Hook by KodingDev

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add hooks/kodingdev/meridian/session-start

Clone the repo

git clone --depth 1 https://github.com/KodingDev/meridian

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 1 finding. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

SessionStart scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the commands this hook runs, not an audit. A hook is shell that executes on your machine at the event it names, which is why every command in it is printed with what was found.

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

"command": "node -e \"let r=process.env.CLAUDE_PLUGIN_ROOT||process.env.PLUGIN_ROOT;if(!r)process.exit(0);let cp=require('child_process');if(process.platform==='linux'&&/^[a-zA-Z]:/.test(r)){try{r=cp.execFileSync('wslpat

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

PreToolUse — 94% identical, 6 lines differ

hooks/hooks.json · 14 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "",
      "hooks": [
        {
          "type": "command",
          "command": "node -e \"let r=process.env.CLAUDE_PLUGIN_ROOT||process.env.PLUGIN_ROOT;if(!r)process.exit(0);let cp=require('child_process');if(process.platform==='linux'&&/^[a-zA-Z]:/.test(r)){try{r=cp.execFileSync('wslpath',['-u',r],{encoding:'utf8'}).trim()}catch{r='/mnt/'+r[0].toLowerCase()+r.slice(2).split(String.fromCharCode(92)).join('/')}}cp.execFileSync(process.execPath,[r+'/hooks/session-start.mjs'],{stdio:'inherit'})\"",
          "async": false
        }
      ]
    }
  ]
}

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

yesterday First seen · 14 lines scan A 88863c98cf39

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository KodingDev/meridian (5 stars, last pushed 1mo ago), licensed MIT. Its token cost is not measured: a hook is shell that never enters the context. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Languages

SessionStart

Getting it into your agent

Grade A, and why

Runs shell commandslowCapability

Copies of this mod

What it actually says

What this file has done since we first saw it

Other hooks, from other repositories

PostToolUse

SessionStart

SessionStart

PreToolUse

SessionStart

SessionStart